Detachable chair-back



(No Model.)

J. H. HAULENBEGK. DETAOHABLE CHAIR BACK.

' Patented Mar. 3, 1891.

'NHE TATES Ariana nrrcn.

J OIIN H. IIAULENBEOK, OF CLEVELAND, OHIO, ASSIGNOR TO A. OUSIIMAN BISHOP, OF DETROIT, MICHIGAN.

DETACHABLE CHAI R-BAOK.

SPECIFICATION forming part of Letters Patent No. 447,682, dated March 3, 1891.

Application filed July 31, 1890. Serial No. 360,559. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN H. HAULENBECK, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Detachable Chair- Backs, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in detachable chair-backs; and the invention consists in the peculiar construction of vertical spring-arms supporting the back-piece, and, further, in the peculiar construction of the back, whereby it forms a clamp, and, further, in the peculiar construction of the clamp for attaching the springarms to the chair; also, in the peculiar construction, arrangement, and combination of the various parts, as hereinafter more fully described and claimed.

In the drawings which accompany this specification, Figure 1 is a perspective view of my improved device attached to a chair,

the chair being shown in dotted lines. Fig. 2 is a front elevation of the back, showing different adjustments thereof. Fig. 3 is a vertical central section through the chairclamp. Fig. at is a horizontal section on line 00 a: in Fig. 1.

A is the chair. Bis the chair-bottom, to which are secured the clamps, which are of the following construction.

O is a casting forming the bodyof the clamp, provided at its lower end with the horizontal eXt-endin g clamping-j aw D, adapted to engage on the under side of the seat and with the vertically-apertured ribs E, in which are secured the hook clamping bolts F, screwthreaded at their lower end and adapted to receive the winged nuts G. The clamp is also provided with the upward extension H, having the flange I at its outer edge. This extension His suitably apertured to receive the lower ends of the vertical spring-arms J. To secure this clamp in position, the winged nut is loosened until there is sufficient space between the hook K of the bolt and the flange D of the casting to engage upon the seat B. By then turning the nut in the reverse direction the clamp is held firmly upon the seat, there being a pair of these clamping-bolts to each clamp.

The hook K is provided-with the pin L, adapted to engage into the wood of the seat. 5 5 and prevent it from turning. The top of the ribs E are preferably notched at M to receive the hook K and prevent it from turning when the nut G is screwed up.

The vertical spring-arms .I consist of a single piece of spring-wire bent to form the vertical securing portions a, the coil Z), the lower vertical portion 0, the bend d, the vertical portion 6 and the bend f, the other half of the support being of corresponding shape. The two securing ends of the wire thus bent are engaged in suitable apertures in the Vertical portion II of the clamp, the coil I) having a bearing against the flangelof the clamp and preventing the spring-arm from moving 7o outwardly. There is some little space be tween the two vertical portions 6 of the springarm, as plainly shown in the drawings.

The cross-bar N consists of two strips of veneer g g, separated by the block h and secured together centrally only by means of this block h. I preferably form this crossbar by taking two pieces of veneer of the proper shape and size, placing between them the block h, and then glue the pieces together. So The space between the two parts of the back is sufficient to allow of the engagement therein of the Vertical springarms J, which are clamped between the two parts of the back by means of the clamping-bolts i and the winged nuts j thereon. It is evident that the parts being thus constructed will allow the back N to be vertically adjusted to suit the user. It is also evident that the spring-arms may be adjusted to the extent of the space c between the two parts thereof laterally in relation to the back, as shown in Fig. 2, and if the chainseat is too wide to allow of the arms J being placed in a vertical position they may be placed at an angle to the back ,or cross-bar without affecting the efficiency of the device. It is also evident that the bend cl in the vertical spring-arms brings in the upper ends thereof sufficient to enable me to use shorter cross-bars than would be the case if they were constructed vertical their entire length and makes a much more compact, economical, and convenient device.

The bend (Z in the vertical springarms enables me to apply my device to arm-chairs as well as to ordinary straight-back chairs, the vertical portion e passing up inside of the arms.

What I claim as my invention is 1. In a detachable chair-back, the combination, with a body having vertical pockets therein, hooked bolts passing through the body, and flanges on the bottom of the body, of spring-arms secured in the said pockets and coiled at their lower ends, and a back consisting of two parallel yielding strips having compression-bolts passing through the ends, substantially as described.

2. In a detachable chair-back, the combination, with the clamps adapted to be secured to the seat of the chair, of two spring-arms secured thereto and bent inwardly at a point near their centers, whereby they are adapted to fit under the arms of the chair, and an adjustable back, substantially as set forth.

In a detachable back, the combination, with the vertical supporting-arms, of a back consisting of two separated bars centrally secured together, and means for clamping said bars upon the arms, substantially as described.

4.. In a detachable chair-back, the cross-bar N, consisting of the two like flexible strips g g, the spacing-bar h, the clamping-bolts i, and nuts j, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN ll. IIAULENBECK.

Vv'itnesses:

(J. F. LAKEMAN, FRED PICKERING. 

